photosystem I


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Related to photosystem I: Photosystem II

photosystem I

[′fōd·ō‚sis·təm ′wən]
(biochemistry)
One of two reaction sequences of the light phase of photosynthesis in green plants that involves a pigment system which is excited by wavelengths shorter than 700 nanometers and which transfers this energy to energy carriers such as NADPH that are subsequently utilized in carbon dioxide fixation.
References in periodicals archive ?
The aim of proposed project is to monitor stress-induced structural changes (different light conditions, elevated temperature) of the plant photosynthetic apparatus at the level of individual supercomplexes of Photosystem I and Photosystem II and their associated antenna complexes using transmission electron microscopy and single particle image analysis.
In normal photosynthesis, photosystem I grabs electrons from proteins higher up in the photosynthesis chain reaction.
According to the team, the viral photosystem I genes allow the cyanophages to not only take electrons from the proteins involved in photosythesis but also from other algal proteins.
The bacteria genes co-opted by the marine viruses are part of a group, or "cassette" of genes called photosystem I.
Photosystem I and another gene cassette called photosystem II genes are essential to the first steps of photosynthesis, absorbing energy from light and transforming into a form that can be used to fuel further reactions in the process.
students Itai Sharon and Ariella Alperovitch that led to the discovery of the photosystem I cassette in viruses.
During photosynthesis, plants have two photosystems that work in tandem: photosystem I and photosystem II.